it's been said before, for whatever reason this phone lags a lot on the first boot of gummy. just deal with it, let it sync, install your apps, etc and give it at least 20 minutes of use and a reboot and make sure everything is synced and whatnot before coming here to complain. the lag will go away, dunno why it's there in the first place but it's a one time thing.
Sent from my AOKP SCH-i500
^^^^^^That^^^^^^^ It does go away. I promise.